Monitoring and control of a filter in a power network

Details Monitoring and control of a filter in a power network Monitoring and control of a filter in a power network

1994-09-15

1996-10-22

Nappi, Robert

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323218, 323233, 327553, G05F 170

Patent

active

055680429

ABSTRACT:
In a method for monitoring and/or control of a plant component (4A, 4B, 4C, 4D) connected to an electric power network (N1, N2), for example a tunable filter for harmonic filtering or a capacitor bank for generating reactive power in a converter plant for high-voltage direct current, products of, respectively, a voltage (U.sub.A, U.sub.B, U.sub.C, U.sub.D) occurring in the plant component and of a current (I.sub.A, I.sub.B, I.sub.C, I.sub.D, I.sub.AC) flowing therethrough are formed, and sine and cosine signals, the frequencies of which are equal to the product of the ordinal number of a selected tone and a fundamental frequency associated with the power network, the products are integrated and the phase difference (.phi..sub.un -.phi..sub.In) and/or the amplitude value (SUn, SIn, respectively) between/for the components of the voltage and the current of the selected tone are formed by quotient generation, multiplication, and summation of the integrated products.

REFERENCES:
patent: 4811236 (1989-03-01), Brennen et al.
patent: 5351181 (1994-09-01), Brennen et al.

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